Antenna shield for eliminating interference and undesirable waves



Mar'ch 1, 1932. E. H. HAND 1,847,872

ANTENNA SHIELD FOR ELIMINATING INTERFERENCE AND UNDESIRABLE WAVES Filed March '7, 1928 IN VENTOR. ErLe M 310/1111 ATTORNEY Patented Mar. 1 1932 UNITED STATES PATENT OFFICE ERLE H. HAND, or new YORK, N. Y.

Application filed March 7, i928. Serial No. 259,624.

7 This invention relates generally to radio antennae and has more particular reference to a novel shield therefor.

The invention has for an object the provision of a device of the class mentioned which is of simple durable construction, desirable and efficient in action and which can be manufactured and sold at a reasonable cost.

The device is portable and capable of being applied to all types of loop antennae. It consists of an inner layer of electric insulation material and an outerlayer of metal or radio wave shield. Any means for attaching the device to an antenna may be used, and it is so attached so as to be insulated from the antenna for permitting grounding without grounding desired reception. The outer metal layer may be provided with extensible shield members for increasing the effective range of the antenna.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

Referring to the accompanying drawings, forming a material part of this disclosure:

Fig. 1 is a perspective view of a loop antenna having the invention applied thereto.

Fig. 2 is a horizontal sectional view of the shield per se, taken on the line 2-2 of Fig. 1.

Fig. 3 is a perspective view of a loop antenna of different design, having the invention applied thereto.

Fig. 4 is a sectional view of the shield per se, taken on the line 4- of Fig. 3.

Fig. 5 is a perspective view of a loop antenna of a further different design, having the invention applied thereto.

Fig. 6 is a horizontal sectional view of the shield per se, taken on the line 66 of Fig. 5.

Fig. 7 is a perspective view of a loop antenna of a further diflerent design, having the invention applied thereto.

Fig. 8 is a horizontal sectional view of the shield per se, taken on the line 6-6 of Fig. 7.

each other.

F ig. 9 is a perspective view of a loop antenna of a further different design, having the invention applied thereto. Y

Fig; 10 is a horizontal sectional viewof the shield 'per se, taken on the line10"10 5 ofFig.9.

Fig. 11 is fragmentaryperspective view of a portion of the invention shield construction according to modified form.

Fig. 12 is a front viewthereof, but of further modified form. l The reference numeral 15 indicates generally a loop antenna of rectangular shape, and having theshield 16 attached to one'edge thereof by means of a string 17 It should be understood thatthe attaching means is not limited to a string, and maybe any means whatsoever; The shield 16 consists of an 'innor layer 18 of electric insulation material,

such as rubber, fibre, or the like, and an outer layer 19 of metal, that is, a radio wave shield,

antenna of diamondshape and having the shield 16 attached'to one side thereof. 'Necessarily it must be formed of an upper section 21 and a lower section 22 at an angle to The reference numeral 23 indicates generally a'loop antenna of rectangular shape having the winding across its front and rearfaces indicated bylines 24, and having the shield 16 attached tof one face thereof r The reference numeral 25 indicates generallya loop antenna woundon a vertical block and having the shield 16 attachedto cover a corner and the two adjacent sides of the block. 7 I I 1 The reference numeral 26 indicates gener ally a loop antenna wound on a vertical cylinder, and having the shield 16 attached to cover one side thereof. Necessarily this shield is of curved form.

The modified form of thedevice illustrated in Fig. 11 discloses the outer layer 19 formed with a plurality of parallel dove tailed grooves 27 engaged by the dove tailed both layers beingsecured together by'means tongues 28 on the rear face of a plurality of i parallel and adjacent shield members 29.. The tongues are tight fits in the grooves so that the members 29 frictionally hold various extended positions to which they may be placed. One, two or any number of these shield members 29 may be extended desirable distances for increasing the effective range of the device. Elliptical shield members 80 formed with elongated slots 31 are adj ustably secured to the tips of the members 29 by I means of screws 32 passing thru the slots and engaging the members 29". These may also be extended for further increasing the shielding range of the device.

,VVhile I have shown and described a pre-' ferred embodiment of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention what I claim as new and desire to secure by United States Letters Patentis z? 1. A shield for a loop antenna, comprising a shield for concentrating radio waves from a certain direction and for shutting out interfering waves from other directions, an open layer of insulating material adapted to fit that portion of the antenna most distantfrom the source of the radio waves which it is desired to receive, said shield being formed from a plurality of. metal shield members,

i and coactingmeans on said shield members and insulation layer for extendibly supporting said shield members, whereby the shield ing area may be changed by extension of said fmetal shield member.

2. A shield for aloop antenna,,comprising a shield for concentrating radio waves from a certain direction and for shutting out interfermg waves fromother directions, a layer of insulating material adapted .to fit the outer portion of that part of the antenna most distant from the source of the selected radio waves, said shield comprising a plurality of adjacent metal shieldmembers adjustably mounted on the outer side of saidinsulating lmaterial, and additional shield members superimposed extensibly, mounted on said shield members, whereby theshielding area may be changed by adjustment of the shield members and the additional shield members. In testimony whereof I have afiixed my signature.

ERLE H. HAND. 

